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Using Pharmacological Manipulation and High-precision Radio Telemetry to Study the Spatial Cognition in Free-ranging Animals
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Spatial perception and adaptive sonar behavior.

Murat Aytekin1, Beatrice Mao, Cynthia F Moss

  • 1Department of Psychology, Institute for Systems Research, University of Maryland, 1147 Biology/Psychology Building, College Park, Maryland 20742, USA. cmoss@psyc.umd.edu

The Journal of the Acoustical Society of America
|January 12, 2011
PubMed
Summary
This summary is machine-generated.

Big brown bats adjust echolocation calls based on object proximity and angular separation. Bats alter call duration to the nearest object, while call rate tracks the insect target, even with distracters.

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Area of Science:

  • Bioacoustics
  • Animal Behavior
  • Sensory Ecology

Background:

  • Bat echolocation involves dynamic sonar signal adjustments for navigation and foraging.
  • Understanding adaptive sonar behavior requires quantitative analysis of echolocation call design.

Purpose of the Study:

  • To investigate how sonar distracters influence echolocation call design in the big brown bat (Eptesicus fuscus).
  • To analyze the real-time adaptations in echolocation vocalizations in response to task and environment.

Main Methods:

  • Trained big brown bats to track a tethered mealworm target.
  • Introduced a stationary sonar distracter at varying distances and angular offsets.
  • Quantitatively analyzed echolocation call parameters, including call duration and call rate.

Main Results:

  • Eptesicus fuscus adjusted echolocation call duration to the closer of the two objects (target or distracter).
  • The magnitude of call duration adjustment was dependent on the distracter's angular offset.
  • Call rate was consistently adjusted to the insect target's distance, irrespective of the distracter's presence.

Conclusions:

  • Big brown bats exhibit sophisticated spatial information processing during echolocation.
  • Sonar distracters significantly influence adaptive echolocation behavior, particularly call duration.
  • Findings provide insights into the perception and processing of auditory spatial information in bats.